Video performance problem

Hey guys, Im running on board graphics and a 933mhz processor and about 512ram.

The problem is, when i try to play little Anime music videos or cartoon episodes the subtitles dont keep up, and the color quality isnt that great. Any idea on how to improve this, would bumping the shared memory from 32mb to 64mb help at all? I'm playing these in winamp and divx, same problem.